Problems With Switched Ground Input for IC

I'm using a EDE2208 turn a momentary button into a latched. I was able to get the IC to work normally using a 5V powered momentary button like in the diagram below.



I want to try to get this IC to be able to also operate using a momentary button that provides a switched ground signal. I tried supplying the input with a steady 5V and then having the switched ground button change the signal slightly when pushed. This worked fine, however upon startup the 5V input to the IC triggers it to output the 5V. I want to be able to have the startup output the 0V untill the button is pressed.

Is there anyway I could pre-process the signal from the switched ground button, so that at startup the IC wont send out the 5V?

 

Thank you for the response, it is very helpful. The initial outputs are low (0V), which makes this much easier. I'm going to try messing around with the circuit on my breadboard this week and see what kind of other problems I can run into.

 

I'm currently using a 16.7 mA relay on the output, which operates fine with the IC. Unless I missed something in your response, my big question is how would I go about having a switched ground momentary button as an input.

Ive come up with an idea to use an unlatched relay for this situation on the input side of the IC. When the switched ground button is pushed, it will trigger the relay to ouput the 5V to the IC. At startup the IC will not see any voltage and revert to its low (0V) state output.




I'm going to be making this board in Eagle, so the more relays I have to add to worse off I am. The board is getting big and the component prices are adding up.

I'm a Mech E, so that is why I reverted to using a more mechanical approach. Is there any "prettier/more simple" approaches that I could take?

Thank You

 

Yeah, I learned that one the hard way. Luckily I purchased a few of the IC's.

 

So, I got everything working on my breadboard. I sent the eagle file to OSH park and now the flip/flop isn't functioning properly. When ever i press the Momentary button the circuit actives, however when pressing the button again sometimes the flip/flop reverts back to 0V and other times it just stays at 5V. I disconnected the relay and the flip/ functions normally, so i'm assuming the relay is the culprit.

I measured the current the relay is drawing from the flip/flop to be 20mA, which is below the Max of 25mA for each output pin. So I tried using the transistor like you had mentioned, the only way I could get it to function was to wire it up like in the picture below. The problem persists though, the flip/flop doesn't always revert back to 0V on the second push of the momentary button.

 

Haha. Nope from NJ unfortunately.

I did some research on NPN transistors last night and I think I've figured it out. My only question is in the schematic below:
a) Is this correctly wired?
b) How does the relay coil get grounded, it seems like the collector would be outputting a voltage signal not a ground signal?



Also would a PN2222A transistor work for this application?

I really appreciate all the help Steve.

 

Haha, much better than NJ.

Yeah, I didn't put that in b/c that's the output from the IC, which is just a 5V signal or nothing.

So thinking about the EMF that is created when the relay discharges, is it possible that EMF could influence another relay on the board?

I placed the relays very close together on the board for trace simplicity, which might be the reason the IC only hangs up when I try to switch it for the second time (closing the relay that is after the IC). The input to the IC runs through the leg of a relay, which i'm hoping is what is being influenced by the post IC relay.

Is this possible, if so would there be any other solutions besides physically moving the relays?

 

I feel like this would be easier than trying to take a picture of the small PCB. This is a section of the eagle file I made.

 

I just got it working, thanks for all of your help.